Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
lam thuc » lam thuoc, am thuc, nam thuc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
va lam » van lam, va lap
vi hoa » voi hoa, bi hoa, vi ha
vi hoc » li hoc, va hoc
va hoa » van hoa, va hoc, ma 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 sach ky nang xa hoi. hieu va lam thuc va hanh ((((vi hoa) or (vi hoc))) or (va hoa)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. hieu va lam thuc va hanh ((((vi hoa) OR (vi hoc))) OR (va hoa)) viet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. hieu va lam thuc va hanh ((((vi hoa) or (vi hoc))) or (va hoa)) viet*.