Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
danh vai » danh sai, danh va, doanh van
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
va danh » va dinh, va dan, va hanh
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
tuc va » thuc va, truc va, tuc xa
ban da » ban dan, ban dau, ban dac
ban xa » ban va, ban ma, ban a
cua tu » cua tuc, cua su, cua cu

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 thu ((ban xa) OR (ban da)) hoi. hieu van cam tuc va danh vai ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((ban xa) OR (ban da)) hoi. hieu van cam tuc va danh vai ((cua tre) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((ban xa) OR (ban da)) hoi. hieu van cam tuc va danh vai ((cua tre) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((ban xa) OR (ban da)) hoi. hieu van cam tuc va danh vai ((cua tre) or (cua tu))*.