Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
truoc va » truc va, truong va, truoc bua
thuoc va » thuc va, thuoc ma, thuong va
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sac ky » cac ky, sai ky
va lam » van lam, va lap
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 nang xa hoi. hieu va lam ((truoc va) OR (thuoc va)) hanh vi 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) OR (thuoc va)) hanh vi hoa viet".
• Adding a wildcard symbol may retrieve word variants: thuat sac ky nang xa hoi. hieu va lam ((truoc va) OR (thuoc va)) hanh vi hoa viet*.