Perhaps you should try some spelling variations:
sach kem » hanh kem
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve chai » ve cai, ve chat, va chai
chai tu » cai tu, choi tu, chay tu
va hanh » van hanh, va thanh, va danh
cu tren » tu tren, dua tren
sac ky » cac ky, sai ky
vi cu » vi su, vi xu, vi du

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 kem) or (sac ky)) nang xa hoi. hieu ve chai tu va hanh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach kem) OR (sac ky)) nang xa hoi. hieu ve chai tu va hanh vi cu tren.
• Adding a wildcard symbol may retrieve word variants: te ((sach kem) or (sac ky)) nang xa hoi. hieu ve chai tu va hanh vi cu tren*.