Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
ty nang » ky nang, ty xang, ty hang
cao hoi » cau hoi, co hoi, cao hoc
hieu le » hieu ve, hieu ly, tieu le
hanh di » hanh vi, hanh de, hang di
hieu he » hieu ve, hiem he, hieu hien
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
di cua » dai cua, doi cua, de cua
thu va » thue va, tu va, thu ha

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

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