Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
vat hanh » vat thanh, van hanh, va hanh
nang xa » nang x, lang xa, nang ma
cuu tac » cuu dac, cuu cac, cuu xac
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach v nang xa hoi. ((hieu van) or (hieu qua)) ((cuu thuc) OR (cuu tac)) vat hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach v nang xa hoi. ((hieu van) OR (hieu qua)) ((cuu thuc) OR (cuu tac)) vat hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach v nang xa hoi. ((hieu van) or (hieu qua)) ((cuu thuc) OR (cuu tac)) vat hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach v nang xa hoi. ((hieu van) or (hieu qua)) ((cuu thuc) OR (cuu tac)) vat hanh vi cua te*.