Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hoc sach » hoc sinh, hoc cac, hoc anh
sach thu » sach thue, sach thieu, sach tham
hoc viet » hoc hien
thu dang » thu hang, thu bang, thu dong
dang ma » dang mau, dang mam, dang mat
viec da » viec dat, vien da, viec va
hanh va » hang va, hanh vi
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
o viet » so viet

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

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