Perhaps you should try some spelling variations:
trinh tai » trinh toan, trinh tu, trinh han
tang van » dang van, hoang van, trong van
va trinh » van trinh, va tinh, lap trinh
su sach » so sach, vu sach
tai duc » tai cuc, mai duc, tai du
cac xuc » cam xuc, cac nuoc, chat xuc
duc tre » duoc tren, duc tien
sach ty » sach y, sach tu, sach thu
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
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 ty ((tang van) or (lang xa)) hoi. ((hieu va) OR (hieu qua)) cac xuc va trinh tai duc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((tang van) OR (lang xa)) hoi. ((hieu va) OR (hieu qua)) cac xuc va trinh tai duc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((tang van) or (lang xa)) hoi. ((hieu va) OR (hieu qua)) cac xuc va trinh tai duc tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((tang van) or (lang xa)) hoi. ((hieu va) OR (hieu qua)) cac xuc va trinh tai duc tre*.