Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh hai » thanh hai, nhanh hai, hang hai
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
qua cam » qua cham, qua cac, qua ca
nang xa » nang x, lang xa, nang ma
cam luc » cam xuc, cau luc
luc va » duc va, tuc va, loc va
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sac ky)) nang xa hoi. hieu qua cam luc va hanh hai ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sac ky)) nang xa hoi. hieu qua cam luc va hanh hai ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sac ky)) nang xa hoi. hieu qua cam luc va hanh hai ((cua tre) or (cau tren))*.