Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
ve triet » va trien, su triet
va thanh » gia thanh, va tinh, le thanh
cham loc » cham soc, chon loc, cham o
ve cham » va cham, ve chat, vu cham
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
hieu ve » hieu va, hieu van
vi ve » va ve, gi ve, ve ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang xa) or (nang ma)) hoi. hieu ve cham loc ((va thanh) or (ban thanh)) vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang ma)) hoi. hieu ve cham loc ((va thanh) OR (ban thanh)) vi ve triet.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang ma)) hoi. hieu ve cham loc ((va thanh) or (ban thanh)) vi ve triet*.