Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
hanh tai » thanh tai, hang tai, han tai
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
cao hoc » co hoc, cho hoc, chat hoc
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
xuc ban » duc ban, cuc ban, quoc ban
cua te » cua tu

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 tu nang cao hoc. hieu van cac xuc ban hanh tai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang cao hoc. hieu van cac xuc ban hanh tai ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang cao hoc. hieu van cac xuc ban hanh tai ((dua tren) or (cua te))*.