Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van tuan » van quan, van ban, anh tuan
nang mai » nang ma, nang tai, lang mai
cam luu » tam luu
tuan vi » quan vi, luan vi, quans vi
luu van » cuu van, luan van, luu hanh
tu sach » thu sach, su sach, te sach
hieu va » hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
vi cua » vai cua, di cua

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 hoach)) ly nang mai hoi. ((hieu va) or (lieu va)) cam luu van tuan vi cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ly nang mai hoi. ((hieu va) OR (lieu va)) cam luu van tuan vi cua thuoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ly nang mai hoi. ((hieu va) or (lieu va)) cam luu van tuan vi cua thuoc*.