Perhaps you should try some spelling variations:
xanh tai » hanh tai, anh tai, vanh tai
cua tre » cua te, cuu tre, cua triet
xanh di » danh di, vanh dai
hieu ve » hieu va, hieu van
van hoe » van hoa, van hieu, van hien
van hoc » van hoa
ky tang » ky nang, ky dang, kho tang
sac ky » cac ky, sai ky
ve dat » de dat, va dat, ve dao
vu sac » vu sach, vu san, va sac
nuoc » quoc, duoc, ngoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky tang ((van hoe) or (van hoc)). hieu ve dat nuoc va ((xanh di) OR (xanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky tang ((van hoe) OR (van hoc)). hieu ve dat nuoc va ((xanh di) OR (xanh tai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky tang ((van hoe) or (van hoc)). hieu ve dat nuoc va ((xanh di) OR (xanh tai)) cua tre*".