Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
lam truoc » nam truoc, lam truong, nam thuoc
lam thuoc » nam thuoc, am thuc, cay thuoc
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vi hoa » voi hoa, vi hoc, va 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 lang) OR (ky tang)) xa hoi. hieu va ((lam truoc) or (lam thuoc)) va hanh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ((ky lang) OR (ky tang)) xa hoi. hieu va ((lam truoc) OR (lam thuoc)) va hanh vi hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sac ((ky lang) OR (ky tang)) xa hoi. hieu va ((lam truoc) or (lam thuoc)) va hanh vi hoa viet".
• Adding a wildcard symbol may retrieve word variants: thuat sac ((ky lang) OR (ky tang)) xa hoi. hieu va ((lam truoc) or (lam thuoc)) va hanh vi hoa viet*.