Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
nang cho » nang chon, ngang cho, nang cao
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
cua cau » cua cac, cua chu, cua cay
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu van
cho hoc » co hoc, khoa hoc
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (sach y)) nang cho hoc. ((hieu ve) OR (hieu va)) cac xuc van hanh va cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) nang cho hoc. ((hieu ve) OR (hieu va)) cac xuc van hanh va cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach y)) nang cho hoc. ((hieu ve) OR (hieu va)) cac xuc van hanh va cua cau*".