Perhaps you should try some spelling variations:
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hanh ve » hanh vi, hanh va, hanh kem
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
hieu va » hieu qua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
ve cua » le cua, de cua, te 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 ty nang ma hoi. ((hieu va) OR (lieu va)) cam ((cua ban) or (duc van)) hanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ma hoi. ((hieu va) OR (lieu va)) cam ((cua ban) OR (duc van)) hanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ma hoi. ((hieu va) OR (lieu va)) cam ((cua ban) or (duc van)) hanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ma hoi. ((hieu va) OR (lieu va)) cam ((cua ban) or (duc van)) hanh ve cua tre*.