Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
cham luc » cham soc, nhan luc, cham cuu
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, dieu vu
hieu su » hieu sau, tieu su, hieu so
va danh » va dinh, va dan, va hanh
danh du » danh dau, danh tu, dinh du
cuu tre » cua tre, cau tren, cau treo
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
luc va » duc va, tuc va, loc va
du cuu » tu 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 v nang xa hoi. ((hieu vu) or (hieu su)) cham luc va danh du cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach v nang xa hoi. ((hieu vu) OR (hieu su)) cham luc va danh du cuu tre.
• Adding a wildcard symbol may retrieve word variants: doc sach v nang xa hoi. ((hieu vu) or (hieu su)) cham luc va danh du cuu tre*.