Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
chat luc » chat xuc, chat lua, nhan luc
hieu cao » chieu cao, hieu cac, hieu ca
thi hanh » thi thanh
thi hang » thi nang, thi hong, thi thanh
luc van » luoc van, luu van, duc van
su sach » so sach, vu sach
lam va » dam va, lam ha, am va

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 hang) or (thi hanh)) xa hoi. hieu cao chat luc van hanh ((lam va) OR (nam va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thi hang) OR (thi hanh)) xa hoi. hieu cao chat luc van hanh ((lam va) OR (nam va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((thi hang) or (thi hanh)) xa hoi. hieu cao chat luc van hanh ((lam va) OR (nam va)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((thi hang) or (thi hanh)) xa hoi. hieu cao chat luc van hanh ((lam va) OR (nam va)) triet*.