Perhaps you should try some spelling variations:
doc sach » toc sach, nuoc sach, dac sac
thu nang » thi nang, thu hang, thu bang
hanh vai » hanh vi, hanh va, hanh tai
cau tren » cu tren, dau tren, ca tren
hoc sach » hoc sinh, hoc cac, hoc anh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau treo
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao

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