Perhaps you should try some spelling variations:
sach tham » sach nha
ve triet » va trien, su triet
thuc va » thuc vat, thuc dan, thuc day
thue va » thuyet va, thuc vat, thuat va
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ve cac » va cac, vien cac
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) or (sach tham)) nang xa hoi. hieu ve cac ((thue va) or (thuc va)) hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach tham)) nang xa hoi. hieu ve cac ((thue va) OR (thuc va)) hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach tham)) nang xa hoi. hieu ve cac ((thue va) or (thuc va)) hanh vi ve triet*.