Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hanh le » thanh le, hanh ve, hanh de
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
cua tre » cua te, cuu tre, cua triet
luc va » tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa
le cua » ly cua

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 ky nang ma hoi. ((hieu ve) OR (hieu va)) cham ((luc va) or (duc va)) hanh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. ((hieu ve) OR (hieu va)) cham ((luc va) OR (duc va)) hanh le cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. ((hieu ve) OR (hieu va)) cham ((luc va) or (duc va)) hanh le cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. ((hieu ve) OR (hieu va)) cham ((luc va) or (duc va)) hanh le cua tre*.