Perhaps you should try some spelling variations:
thanh tiep » thanh hiep, thanh tien, thanh thieu
hieu van » thien van, lieu va, hieu ve
thuc day » thuc dan, thuc vat
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
xuc va » duc va, tuc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa
can te » van te, can ve, can we

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 ky nang ma hoi. ((hieu van) OR (hieu va)) cau ((xuc va) or (thuc day)) thanh tiep can te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. ((hieu van) OR (hieu va)) cau ((xuc va) OR (thuc day)) thanh tiep can te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. ((hieu van) OR (hieu va)) cau ((xuc va) or (thuc day)) thanh tiep can te*".