Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh dai » hanh tai, hanh dao, vanh dai
nam thuc » nam thuoc, am thuc, nam thu
hoc sach » hoc sinh, hoc cac, hoc anh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau treo
su sach » so sach, vu sach
va nam » van nam, ha nam, va nay

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (hoc sach)) ky nang xa hoi. hieu va nam thuc va hanh dai ((cuu tre) OR (cau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (hoc sach)) ky nang xa hoi. hieu va nam thuc va hanh dai ((cuu tre) OR (cau tren))~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (hoc sach)) ky nang xa hoi. hieu va nam thuc va hanh dai ((cuu tre) OR (cau tren))*.