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