Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
hieu vu » hieu va, hieu su, dieu vu
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
soc va » hoc va, loc va, goc va
doc va » duoc va, hoc va, duc va
ve cua » le cua, de cua, te cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang ma hoi. ((hieu vu) or (hieu ve)) cham ((soc va) OR (doc va)) thanh ve cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ma hoi. ((hieu vu) OR (hieu ve)) cham ((soc va) OR (doc va)) thanh ve cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ma hoi. ((hieu vu) or (hieu ve)) cham ((soc va) OR (doc va)) thanh ve cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ma hoi. ((hieu vu) or (hieu ve)) cham ((soc va) OR (doc va)) thanh ve cua tu*.