Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
hang tai » hang va, dung tai
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va hang » van hang, va nang, va lang
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ky) or (sach y)) nang xa hoi. hieu va cac truc va hang tai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach y)) nang xa hoi. hieu va cac truc va hang tai ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach y)) nang xa hoi. hieu va cac truc va hang tai ((cua te) or (cua tu))*.