Perhaps you should try some spelling variations:
chat hoc » chat hoa, chat thom, cho hoc
hai chau » lai chau, ha chau, hat chau
va hanh » van hanh, va thanh, va danh
hai chu » hoi chu, hai chi, hai phu
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ((chat hoc) or (co hoc)). hieu ve cam tuc va hanh ((hai chau) or (hai chu)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((chat hoc) OR (co hoc)). hieu ve cam tuc va hanh ((hai chau) OR (hai chu)) treo.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((chat hoc) or (co hoc)). hieu ve cam tuc va hanh ((hai chau) or (hai chu)) treo*.