Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma hoa

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 y nang ma hoi. hieu ve cam ((dua ban) or (duc van)) thanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu ve cam ((dua ban) OR (duc van)) thanh vi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu ve cam ((dua ban) or (duc van)) thanh vi ((cua tre) or (cau tren))*.