Perhaps you should try some spelling variations:
trinh tai » trinh toan, trinh tu, trinh han
tang van » dang van, hoang van, trong van
cham luc » cham soc, nhan luc, cham cuu
va trinh » van trinh, va tinh, lap trinh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
lang ha » long ha
hieu va » lieu va, hieu qua
va cham » va chat, va tham
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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 ty ((tang van) or (lang ha)) hoi. hieu va cham luc va trinh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((tang van) OR (lang ha)) hoi. hieu va cham luc va trinh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((tang van) or (lang ha)) hoi. hieu va cham luc va trinh tai cua tre*.