Perhaps you should try some spelling variations:
cham luc » nhan luc, cham cuu, chat lua
te sach » toc sach
cuu tre » cau tren, cau treo
hanh le » thanh le, hanh ve, hanh de
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa

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