Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
dong cac » duong cac, dong bac, dung cac
cac cau » cac mau, bac cau, ca cau
ca dong » cao dong, cau dong, cua dong
cam tuc » cam tu, nam thuc, dam thuc
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
te sach » toc sach

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) or (te sach)) ky nang cao hoi. hieu van ((cam tuc) or (cam xuc)) ca dong cac cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang cao hoi. hieu van ((cam tuc) OR (cam xuc)) ca dong cac cau tren.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang cao hoi. hieu van ((cam tuc) or (cam xuc)) ca dong cac cau tren*.