Perhaps you should try some spelling variations:
van hoang » van hoan, quan hoang, tran hoang
va trien » va truyen, va thiet, va tuyen
cham luc » cham soc, nhan luc, cham cuu
va triet » va thiet, ve triet, cua triet
va hang » van hang, va nang, va lang
te sach » toc sach
sach ky » sac ky, sach y, sach ty
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho 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 ky tang ma hoi. hieu vu cham luc ((va hang) or (van hoang)) dau ((va triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang ma hoi. hieu vu cham luc ((va hang) OR (van hoang)) dau ((va triet) OR (va trien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang ma hoi. hieu vu cham luc ((va hang) or (van hoang)) dau ((va triet) OR (va trien))*".