Perhaps you should try some spelling variations:
dung cong » dung trong
vat dung » van dung, va dung, viet dung
cong cua » cong cu, dong cua, huong cua
lang xa » lang ha, dang xay, lang van
qua cam » qua cham, qua cac, qua ca
cam tuc » cam xuc, cam tu, nam thuc
tuc vat » thuc vat, tuc va, tuc hat
cua tre » cua te, cuu tre, cua triet

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 thieu) or (sach y)) ((lang xa) or (nang x)) hoi. hieu qua cam tuc vat dung cong cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thieu) OR (sach y)) ((lang xa) OR (nang x)) hoi. hieu qua cam tuc vat dung cong cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach thieu) or (sach y)) ((lang xa) or (nang x)) hoi. hieu qua cam tuc vat dung cong cua tre*.