Perhaps you should try some spelling variations:
tinh tai » trinh tai, tinh thai, tinh hai
bang cau » hang cau, bang cac, nang cao
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, su sach, te sach
cam tuc » cam xuc, cam tu, dam thuc
va tinh » may tinh
cuc tre » duc tre, cua tre, cuu tre
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
hieu ve » hieu van
ty bang » ty xang, te bang, ty hang

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 bang cau hoi. ((hieu ve) OR (hieu va)) ((cam tuc) or (nam thuc)) va tinh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty bang cau hoi. ((hieu ve) OR (hieu va)) ((cam tuc) OR (nam thuc)) va tinh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty bang cau hoi. ((hieu ve) OR (hieu va)) ((cam tuc) or (nam thuc)) va tinh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty bang cau hoi. ((hieu ve) OR (hieu va)) ((cam tuc) or (nam thuc)) va tinh tai cuc tre*.