Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
va pham » van pham, va phat, va phap
cua tre » cua te, cua triet, dua tren
su sach » so sach, vu sach
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
cuu tre » cau tren, cau treo
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (hoc sach)) ky lang ha hoi. lieu va pham duc va thanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (hoc sach)) ky lang ha hoi. lieu va pham duc va thanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (hoc sach)) ky lang ha hoi. lieu va pham duc va thanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (hoc sach)) ky lang ha hoi. lieu va pham duc va thanh vi ((cua tre) OR (cuu tre))*.