Perhaps you should try some spelling variations:
te sach » toc sach
sach ly » sach y, sach lo, sach ty
day cua » dai cua
dat cua » dai cua, mat cua, dan cua
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
ve cac » va cac, vien cac
du va » dau va, tu va, vu va
su va » su van, tu va

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 ly nang ma hoa. hieu ve cac ((du va) or (su va)) thanh ((dat cua) OR (day cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang ma hoa. hieu ve cac ((du va) OR (su va)) thanh ((dat cua) OR (day cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang ma hoa. hieu ve cac ((du va) or (su va)) thanh ((dat cua) OR (day cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ma hoa. hieu ve cac ((du va) or (su va)) thanh ((dat cua) OR (day cua)) tre*.