Perhaps you should try some spelling variations:
hieu cac » hieu luc, hieu va, hieu van
ban hanh » ban hang
chat luc » chat xuc, chat lua, nhan luc
sach thi » sach thu, sach tai, sach thieu
hieu cao » chieu cao, hieu ca, kieu cao
thi nang » thi cong, ki nang, thi hanh
luc ban » duc ban, cuc ban, luc bat
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
lam va » nam va, dam va, am va
lam ha » nam ha, dam ha, lam chat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thi nang xa hoi. ((hieu cao) or (hieu cac)) chat luc ban hanh ((lam va) OR (lam ha)) trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi nang xa hoi. ((hieu cao) OR (hieu cac)) chat luc ban hanh ((lam va) OR (lam ha)) trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thi nang xa hoi. ((hieu cao) or (hieu cac)) chat luc ban hanh ((lam va) OR (lam ha)) trien".
• Adding a wildcard symbol may retrieve word variants: su sach thi nang xa hoi. ((hieu cao) or (hieu cac)) chat luc ban hanh ((lam va) OR (lam ha)) trien*.