Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
cua thuoc » cay thuoc, cua nuoc, cua quoc
van thanh » ban thanh, van tuan
thu sach » thuat sach, thuoc sach, thu hoach
nang mai » nang ma, nang tai, lang mai
thanh vi » hanh vi, thanh va, thanh ve
luc van » luoc van, luu van, duc van
tu sach » su sach, te sach, tu cach
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) y nang mai hoi. hieu va cam luc van thanh vi ((cua thuoc) OR (nha thuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang mai hoi. hieu va cam luc van thanh vi ((cua thuoc) OR (nha thuoc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang mai hoi. hieu va cam luc van thanh vi ((cua thuoc) OR (nha thuoc))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang mai hoi. hieu va cam luc van thanh vi ((cua thuoc) OR (nha thuoc))*.