Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh vai » danh va, doanh van, dang van
danh sai » dung sai, danh bat, danh dau
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nam tuc » nam thuc, nam truc, nam tu
ro hoc » mo hoc, o hoc, so hoc
cua te » cua tu

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 ty nang ((ro hoc) or (co hoc)). hieu van nam tuc xa ((danh vai) OR (danh sai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((ro hoc) OR (co hoc)). hieu van nam tuc xa ((danh vai) OR (danh sai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((ro hoc) or (co hoc)). hieu van nam tuc xa ((danh vai) OR (danh sai)) cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((ro hoc) or (co hoc)). hieu van nam tuc xa ((danh vai) OR (danh sai)) cua te*.