Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
va nham » va cham, va tham, va nha
tu cach » tu cac
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
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 cach) or (su sach)) ky tang ma hoi. hieu va nham thuc va hanh ((vi cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky tang ma hoi. hieu va nham thuc va hanh ((vi cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky tang ma hoi. hieu va nham thuc va hanh ((vi cua) or (dai cua)) tre*.