Perhaps you should try some spelling variations:
cuc tren » cu tren, duc tren, nuoc tren
hoc sach » hoc sinh, hoc cac, hoc anh
tinh hai » tinh thai, tinh chat, trinh han
hieu van » hieu va, thien van, lieu va
hai cuc » tai cuc, hai cua, thai cua
luc may » truc may, phuc may
cam luc » cam xuc, cau luc
van cam » van nam, van lam, van cau
tu sach » thu sach, su sach, te sach
ma hoi » mai hoi, ma hoa, me hoi

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) or (hoc sach)) ky nang ((ma hoi) or (xa hoi)). hieu van cam luc may tinh hai cuc tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ky nang ((ma hoi) OR (xa hoi)). hieu van cam luc may tinh hai cuc tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky nang ((ma hoi) or (xa hoi)). hieu van cam luc may tinh hai cuc tren*.