Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham luc » cham soc, nhan luc, cham cuu
tang mai » tang ma, lang mai, sang mai
tang tai » dung tai, sang tao, dong tai
hang tai » hang va, dung tai
te sach » toc sach
va hang » van hang, va nang, va lang
va cham » va chat, va tham
hieu va » lieu va, hieu qua
luc va » duc va, tuc va, loc va
thiet » thieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((tang mai) OR (tang tai)) hoi. hieu va cham luc va hang tai ((cua triet) OR (va thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((tang mai) OR (tang tai)) hoi. hieu va cham luc va hang tai ((cua triet) or (va thiet))~".
• Adding a wildcard symbol may retrieve word variants: te sach y ((tang mai) OR (tang tai)) hoi. hieu va cham luc va hang tai ((cua triet) or (va thiet))*.