Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
kho tang » cao tang
danh de » hanh de, dan de, dang de
van hoi » van hoa, van hoe, van loi
cua tre » cua te, cuu tre, cua triet
van hoc » van hoa
hieu ve » hieu va, hieu van
sai kho » dai kho, tai khoa, dai khoa
va danh » va dinh, va dan, va hanh
vu sai » vu hai, vu san, vu dai
xuc va » duc va, tuc va, luc va
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: vu sai kho tang ((van hoi) or (van hoc)). hieu ve cam xuc va danh de ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sai kho tang ((van hoi) OR (van hoc)). hieu ve cam xuc va danh de ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: vu sai kho tang ((van hoi) or (van hoc)). hieu ve cam xuc va danh de ((cua tre) or (cau tren))*.