Perhaps you should try some spelling variations:
te sach » toc sach
dai huu » dao huu, dai hau, dai thua
dai cuu » dai cua
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
du gia » duc gia, dau gia, vu gia
ma hoi » xa hoi, ma hoa, me hoi

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 y nang ((ma hoi) OR (mai hoi)). hieu ve cac du gia thanh ((dai cuu) or (dai huu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((ma hoi) OR (mai hoi)). hieu ve cac du gia thanh ((dai cuu) OR (dai huu)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((ma hoi) OR (mai hoi)). hieu ve cac du gia thanh ((dai cuu) or (dai huu)) tre*".