Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
tinh thai » sinh thai, tinh toan, tinh chat
bang cau » hang cau, bang cac, nang cao
thai cuc » tai cuc, thi cuc, thai cua
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty bang » ty xang, te bang, ty hang
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
va tinh » may tinh
cuc tre » duc tre, cua tre, cuu tre

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 ((cam tuc) or (nam thuoc)) va tinh thai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty bang cau hoi. hieu ve ((cam tuc) OR (nam thuoc)) va tinh thai cuc tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty bang cau hoi. hieu ve ((cam tuc) or (nam thuoc)) va tinh thai cuc tre*.