Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toan hanh » toan thanh, toan anh, tran hanh
duc toan » duc tan, duc ton, duc hoan
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
cua tre » cuu tre, cua triet, dua tren
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thuoc sach)) ky nang xa hoi. hieu ve cam duc toan hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) ky nang xa hoi. hieu ve cam duc toan hanh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) ky nang xa hoi. hieu ve cam duc toan hanh vi ((cua tre) or (cua te))*.