Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
hanh vai » hanh vi, hanh tai, hanh van
hieu van » thien van, lieu va, hieu ve
hanh va » hang va, hanh vi
cam tuc » cam xuc, cam tu, nam thuc
tu sach » thu sach, su sach, te sach
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thi hang xa hoi. ((hieu va) or (hieu van)) cam tuc va ((hanh vai) or (hanh va)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hang xa hoi. ((hieu va) OR (hieu van)) cam tuc va ((hanh vai) OR (hanh va)) cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach thi hang xa hoi. ((hieu va) or (hieu van)) cam tuc va ((hanh vai) or (hanh va)) cua viet*.