Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien dang » thien bang, thien danh, thien nang
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
te sach » toc sach
dang xa » dang xay, lang xa, dang ha
van cam » van nam, van lam, van cau
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
cua tre » cua te, cuu tre, cua triet
cam tu » cam thu, nam tu, dam tu

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

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