Perhaps you should try some spelling variations:
trinh tai » trinh toan, trinh tu, trinh han
sach thu » sach thue, sach thieu, sach tham
tang van » dang van, hoang van, trong van
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
luc lap » luc lam, tuc lap, luc luan
cua tre » cuu tre, cua triet, dua tren
va cam » va cham, va cac, va cao
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 thu ((tang van) or (lang xa)) hoi. hieu va cam luc lap trinh tai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((tang van) OR (lang xa)) hoi. hieu va cam luc lap trinh tai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((tang van) or (lang xa)) hoi. hieu va cam luc lap trinh tai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((tang van) or (lang xa)) hoi. hieu va cam luc lap trinh tai ((cua tre) OR (cua te))*.