Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
thu sach » thuat sach, thuoc sach, thu hoach
tru nang » tra nang, tri nang, truc nano
va triet » va thiet, ve triet, cua triet
manh hai » lanh hai, minh hai, thanh hai
va manh » van manh, va danh, va hanh
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
tuc va » thuc va, truc va, tuc xa

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 manh hai ((va triet) OR (va trien))~.
• 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 manh hai ((va triet) OR (va trien)).
• 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 manh hai ((va triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) tru nang xa hoi. hieu qua hac tuc va manh hai ((va triet) OR (va trien))*.