Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
hanh de » hanh ve, hanh kem
va cam » va cham, va cac, va cao
de su » den su, ve su, de tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((sang ma) or (mang may)) hoi. hieu va cam tuc van hanh de su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((sang ma) OR (mang may)) hoi. hieu va cam tuc van hanh de su triet.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((sang ma) or (mang may)) hoi. hieu va cam tuc van hanh de su triet*.