Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
soc van » hoc van, oc van, sac van
hieu va » lieu va, hieu qua
hieu su » hieu sau, tieu su, hieu so
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo

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 thu nang xa hoi. ((hieu su) or (hieu va)) cham soc van hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang xa hoi. ((hieu su) OR (hieu va)) cham soc van hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang xa hoi. ((hieu su) or (hieu va)) cham soc van hanh vi ((cua tre) or (cuu tre))*.