Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
ve triet » va trien, su triet
hieu van » hieu va, thien van, lieu va
toan ve » toan va, toan ke, toan von
duc gia » quoc gia
cam duc » cam xuc, cao duc, pham duc
tu sach » thu sach, su sach, te 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

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) or (nang ma)) hoi. ((hieu ve) or (hieu van)) cam duc gia thanh toan ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang ma)) hoi. ((hieu ve) OR (hieu van)) cam duc gia thanh toan ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang ma)) hoi. ((hieu ve) or (hieu van)) cam duc gia thanh toan ve triet*.