Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cua tuc » cua tu, cua thuoc, luat tuc
cua duc » cua nuoc, cua quoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky lang xa hoi. hieu va ((nam thuc) or (nam thuoc)) va thanh dai ((cua tuc) OR (cua duc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky lang xa hoi. hieu va ((nam thuc) OR (nam thuoc)) va thanh dai ((cua tuc) OR (cua duc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky lang xa hoi. hieu va ((nam thuc) or (nam thuoc)) va thanh dai ((cua tuc) OR (cua duc))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky lang xa hoi. hieu va ((nam thuc) or (nam thuoc)) va thanh dai ((cua tuc) OR (cua duc))*.