Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
doan van » doan va, hoang van, luan van
vay doan » vay doanh, van doan, van doanh
cham luc » cham soc, nhan luc, cham cuu
tu sach » su sach, te sach, tu cach
van cua » vang cua, ban cua, dan cua
luc vay » luc va, luc van, luoc van
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ly nang xa hoi. ((hieu ve) OR (hieu van)) cham luc vay doan van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ly nang xa hoi. ((hieu ve) OR (hieu van)) cham luc vay doan van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ly nang xa hoi. ((hieu ve) OR (hieu van)) cham luc vay doan van cua tre*".