Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien nang » thien bang, thien dang, trien nang
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
ca tren » cau tren, cu tren, la tren
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
tu tren » tu truyen, tu tieng, tu trong
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thien nang xa hoi. hieu van cam tuc va hanh vi ((cua tre) or (((ca tren) or (tu tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thien nang xa hoi. hieu van cam tuc va hanh vi ((cua tre) OR (((ca tren) OR (tu tren)))).
• Adding a wildcard symbol may retrieve word variants: su sach thien nang xa hoi. hieu van cam tuc va hanh vi ((cua tre) or (((ca tren) or (tu tren))))*.