Perhaps you should try some spelling variations:
thuat sai » thuat bai, thuat san, thuat cai
thuoc van » thuoc va, thuc van, thuoc ban
lam thuoc » nam thuoc, am thuc, cay thuoc
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
lang xa » dang xay, lang van
lang ha » long ha
voi hoa » voi hoat, voi khoa, boi hoa
sai ky » sac ky
va lam » van lam, va lap
vi hoa » vi hoc, va hoa, bi hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sai ky ((lang xa) or (lang ha)) hoi. hieu va lam thuoc van hanh ((vi hoa) or (voi hoa)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sai ky ((lang xa) OR (lang ha)) hoi. hieu va lam thuoc van hanh ((vi hoa) OR (voi hoa)) viet.
• Adding a wildcard symbol may retrieve word variants: thuat sai ky ((lang xa) or (lang ha)) hoi. hieu va lam thuoc van hanh ((vi hoa) or (voi hoa)) viet*.