Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hieu vien » hieu hien, thieu nien, hieu tieng
thu sach » tu sach, thuat sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hanh di » hanh vi, hanh de, hang di
ma hoi » mai hoi, xa hoi, ma hoa
luc va » tuc va, loc va
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang ma hoi. ((hieu vien) or (hieu viec)) cac ((duc va) or (luc va)) hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ma hoi. ((hieu vien) OR (hieu viec)) cac ((duc va) OR (luc va)) hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ma hoi. ((hieu vien) or (hieu viec)) cac ((duc va) or (luc va)) hanh di cua viet*.