Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
van hang » van khang, van hoang, van thang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hang » va nang, va lang, va hanh
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
va nam » van nam, ha nam, va nay
nam tu » nam thu, nam thuc
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach y nang xa hoi. hieu va nam tu ((va hang) or (van hang)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y nang xa hoi. hieu va nam tu ((va hang) OR (van hang)) vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: doc sach y nang xa hoi. hieu va nam tu ((va hang) or (van hang)) vi cuu tre*.