Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh tai » thanh tai, hang tai, han tai
cuu tre » cua tre, cau treo
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
tu sach » thu sach, su sach, tu cach
hieu ve » hieu va, hieu van
nang va » nang van, hang va, nang ma
te sach » toc sach
va hoi » xa hoi, va hoc, va hoa
tuc va » thuc va, truc va, tuc xa
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) or (te sach)) ky nang va hoi. hieu ve cam tuc va hanh tai ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang va hoi. hieu ve cam tuc va hanh tai ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang va hoi. hieu ve cam tuc va hanh tai ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang va hoi. hieu ve cam tuc va hanh tai ((cuu tre) OR (cau tren))*.