Perhaps you should try some spelling variations:
trinh dai » trinh tai, trinh di, trinh da
va trinh » van trinh, va tinh, lap trinh
luat tuc » luat thue
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
lam tuc » lam thuoc, lam truoc, nam thuc
nang so » nang som, nang co, nang su
nang ho » nang hoc, nang co, tang ho
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: so sach y ((nang so) or (nang ho)) hai. hieu van ((lam tuc) or (luat tuc)) va trinh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang so) OR (nang ho)) hai. hieu van ((lam tuc) OR (luat tuc)) va trinh dai cua te.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang so) or (nang ho)) hai. hieu van ((lam tuc) or (luat tuc)) va trinh dai cua te*.