Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
lam truoc » lam thuoc, nam truoc, lam truong
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
voi hoa » voi hoat, voi khoa, boi hoa
va lam » van lam, va lap
sac ky » cac ky, sai ky
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 sac ky nang xa hoi. hieu va lam truoc ((va hanh) or (va thanh)) ((vi hoa) OR (voi hoa)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky nang xa hoi. hieu va lam truoc ((va hanh) OR (va thanh)) ((vi hoa) OR (voi hoa)) viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sac ky nang xa hoi. hieu va lam truoc ((va hanh) or (va thanh)) ((vi hoa) OR (voi hoa)) viet*".