Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban thanh » ban hanh, ban hang
doc sach » hoc sach, toc sach, nuoc sach
kho lang » kho tang, cho lang, tho lang
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
va cam » va cham, va cac, va cao
cuc te » cua te, cuc thue, cuc tieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (doc sach)) kho lang xa hoi. hieu va cam tuc ((va hanh) or (ban thanh)) tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (doc sach)) kho lang xa hoi. hieu va cam tuc ((va hanh) OR (ban thanh)) tai cuc te.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (doc sach)) kho lang xa hoi. hieu va cam tuc ((va hanh) or (ban thanh)) tai cuc te*.