Perhaps you should try some spelling variations:
thien van » thi van
cau treo » cau theo, cau tren, cau triet
sach kem » hanh kem
va triet » va thiet, va trien, ve triet
ban doan » ban doanh, ban dan, ban soan
doan vi » doan va, don vi, doan thi
cac ban » cac dan, cac van, can ban
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
cam cac » ca cac, nam cac, cam chan
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 kem) or (sac ky)) nang xa hoi. thien van cam cac ban doan vi ((va triet) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sac ky)) nang xa hoi. thien van cam cac ban doan vi ((va triet) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sac ky)) nang xa hoi. thien van cam cac ban doan vi ((va triet) or (cau treo))*.