Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
sach thu » sach thue, sach thieu, sach tham
ve pham » vi pham, v pham, ve phan
sach ty » sach y, sach tu, xach tay
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
dao va » dao van, tao va, cao va
do va » do van, so 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) or (sach thu)) nang ma hoi. hieu ve pham duc tan hanh ((dao va) or (do va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang ma hoi. hieu ve pham duc tan hanh ((dao va) OR (do va)) triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang ma hoi. hieu ve pham duc tan hanh ((dao va) or (do va)) triet*.