Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
danh thai » anh thai, dang thai, dinh thai
thai cua » than cua, tai cuc, tri cua
viec cac » vien cac, viec cua, viec lam
nhanh ky » hanh ky, nganh ky, thanh ky
va danh » va dinh, va dan, va hanh
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
van hoi » van hoc, van hoe, van loi
nhan ky » nhan y, nhat ky, than ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((nhanh ky) OR (nhan ky)) lang ((van hoi) or (van hoa)). hieu viec cac duc va danh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((nhanh ky) OR (nhan ky)) lang ((van hoi) OR (van hoa)). hieu viec cac duc va danh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((nhanh ky) OR (nhan ky)) lang ((van hoi) or (van hoa)). hieu viec cac duc va danh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc ((nhanh ky) OR (nhan ky)) lang ((van hoi) or (van hoa)). hieu viec cac duc va danh thai cua tre*.