Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thuc day » thuc dan, thuc vat
hang di » hang doi, hang vi, hang dien
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
y nang » ky nang, ly nang, v nang
hieu v » hieu ve, hieu 2, hieu _
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang cao hoi. ((hieu v) OR (hieu va)) pham ((thuc day) or (thuc hanh)) hang di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang cao hoi. ((hieu v) OR (hieu va)) pham ((thuc day) OR (thuc hanh)) hang di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang cao hoi. ((hieu v) OR (hieu va)) pham ((thuc day) or (thuc hanh)) hang di cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang cao hoi. ((hieu v) OR (hieu va)) pham ((thuc day) or (thuc hanh)) hang di cua te*.