Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
toc sach » hoc sach, doc sach, thuoc sach
nhan luc » nang luc
va lang » va nang, hoa lang
hieu ve » hieu va, hieu van
ve nhan » ve nha, de nhan, va nhan
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
va anh » van anh, va danh, va hanh
y tang » ky tang, 6 tang, 7 tang
dao va » dao van, tao va, do va

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