Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
van hanh » van thanh, ban hanh, van anh
sang tao » hang tai
tao khoi » tao hoi, thao khoa, lao khoa
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
va dan » ca dan, va dao, va dau

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) or (sach thue)) sang tao khoi. hieu ve cam xuc ((van hanh) or (va dan)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thue)) sang tao khoi. hieu ve cam xuc ((van hanh) OR (va dan)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thue)) sang tao khoi. hieu ve cam xuc ((van hanh) or (va dan)) dai cua tre*.