Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hoc sach » hoc sinh, hoc cac, hoc anh
phan duc » pham duc, phan tu, phan dau
cuu tre » cua tre, cau treo
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
hanh xa » hanh ma, hanh xu, canh xa
tu hanh » du hanh, lu hanh, thuc hanh
ve phan » va phan, ke phan, ve phat

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) or (hoc sach)) tu hanh xa hoi. hieu ve phan duc va hanh va ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) tu hanh xa hoi. hieu ve phan duc va hanh va ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) tu hanh xa hoi. hieu ve phan duc va hanh va ((cuu tre) or (cau tren))*.