Perhaps you should try some spelling variations:
te sach » toc sach
cuc ban » cua ban, cac ban, cuu ban
tu nang » tru nang, tu nong, tu nano
hanh va » hang va, hanh vi
tu cong » thu cong, te cong, tai cong
hieu ve » hieu va, hieu van
luc van » luoc van, luu van, duc van
va cua » va chua, via cua, ca cua
ve cac » va cac, vien cac
cua tu » cua tuc, cua su, cua cu

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 ((tu nang) or (tu cong)) ma hoa. hieu ve cac ((luc van) or (cuc ban)) hanh va cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tu cong)) ma hoa. hieu ve cac ((luc van) OR (cuc ban)) hanh va cua tu.
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) or (tu cong)) ma hoa. hieu ve cac ((luc van) or (cuc ban)) hanh va cua tu*.