Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hieu vien » hieu hien, thieu nien, hieu tieng
ban hanh » ban hang
vai cuu » vai cua
va tinh » may tinh
cac xuc » cam xuc, cac nuoc, chat xuc
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
cuu tre » cua tre, cau tren, cau treo

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 tu nang xa hoi. ((hieu vien) OR (hieu viec)) cac xuc ((va tinh) or (ban hanh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang xa hoi. ((hieu vien) OR (hieu viec)) cac xuc ((va tinh) OR (ban hanh)) vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu nang xa hoi. ((hieu vien) OR (hieu viec)) cac xuc ((va tinh) or (ban hanh)) vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach tu nang xa hoi. ((hieu vien) OR (hieu viec)) cac xuc ((va tinh) or (ban hanh)) vai cuu tre*.