Perhaps you should try some spelling variations:
trinh tai » trinh toan, trinh tu, trinh han
tang van » dang van, hoang van, trong van
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
tai cua » thai cua, tai cuc, tri cua
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

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