Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ve bac » ve bao, ve cac, ve ban
bo van » vo van, so van, ho van
do van » dao van, vo van, so van
vi va » vi van, vai va, vu 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 ty nang xa hoi. hieu ((ve bac) or (va cac)) ((bo van) or (do van)) thanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ((ve bac) OR (va cac)) ((bo van) OR (do van)) thanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ((ve bac) or (va cac)) ((bo van) or (do van)) thanh vi va triet*.