Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
cao thi » cau thi, cao tai, can thi
dao thi » do thi, dan thi, dang thi
van cam » van nam, van lam, van cau
san cuu » san cua, san huu, song cuu
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va

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 ((cao thi) OR (dao thi)). hieu van cam ((xuc va) or (tuc xa)) thanh san cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang ((cao thi) OR (dao thi)). hieu van cam ((xuc va) OR (tuc xa)) thanh san cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu nang ((cao thi) OR (dao thi)). hieu van cam ((xuc va) or (tuc xa)) thanh san cuu tre*".