Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hang dai » hoang dai, hang tai, hang dau
hoc sach » hoc sinh, hoc cac, hoc anh
so sanh » do sanh
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
va hang » van hang, va nang, va lang
dai cau » dat cau, da cau, dai hau
tu sach » thu sach, su sach, te sach
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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) or (so sanh)))) ky nang x hoi. hieu ve cam tuc va hang dai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((hoc sach) OR (so sanh)))) ky nang x hoi. hieu ve cam tuc va hang dai cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((hoc sach) or (so sanh)))) ky nang x hoi. hieu ve cam tuc va hang dai cau tren*.