Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
thu sach » thuat sach, thuoc sach, thu hoach
tru nang » tra nang, tri nang, truc nano
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
tu sach » su sach, te sach, tu cach
qua hac » qua hai, qua cac, qua hoat
nang xa » nang x, lang xa, nang ma
hac tuc » thac toc, thai tuc
hai va » hai van, thai va, hoi va

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) or (thu sach)) tru nang xa hoi. hieu qua hac tuc ((va danh) OR (va dinh)) hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) tru nang xa hoi. hieu qua hac tuc ((va danh) OR (va dinh)) hai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) tru nang xa hoi. hieu qua hac tuc ((va danh) OR (va dinh)) hai va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) tru nang xa hoi. hieu qua hac tuc ((va danh) OR (va dinh)) hai va triet*.