Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
dan vai » dan va, dan tai, dan vat
den vai » den va, den vay, den vi
han tai » hang tai, nhan tai, van tai
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y nang xa hoi. hieu ve cac tuc va ((((dan vai) or (den vai))) or (han tai)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang xa hoi. hieu ve cac tuc va ((((dan vai) OR (den vai))) OR (han tai)) va triet.
• Adding a wildcard symbol may retrieve word variants: hoc sach y nang xa hoi. hieu ve cac tuc va ((((dan vai) or (den vai))) or (han tai)) va triet*.