Perhaps you should try some spelling variations:
toc sac » toc sach, toc san, hoc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va minh » van minh, vua minh, va kinh
cua tre » cua te, cuu tre, cua triet
cu tren » tu tren, dua tren
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va

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

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