Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dua tren » dung tren
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, cua thep
sach 2 » sach y
2 nang » v nang
cua te » cua tu
va co » vo co
co su » cao su, co so, co tu
su va » su van, tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach 2 nang xa hoi. lieu va co su va hanh vi ((((cua tre) or (dua tren))) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach 2 nang xa hoi. lieu va co su va hanh vi ((((cua tre) OR (dua tren))) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: hoc sach 2 nang xa hoi. lieu va co su va hanh vi ((((cua tre) or (dua tren))) or (cua te))*.