Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
pham thuc » phap thuc, pham chuc, nham thuc
thu sach » tu sach, thuoc sach, thu hoach
thuc day » thuc dan, thuc vat
hanh di » hanh de, hang di, danh di
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
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) or (thuat sach)) ky nang cao hoi. hieu va pham thuc day ((hanh di) OR (hanh vi)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ky nang cao hoi. hieu va pham thuc day ((hanh di) OR (hanh vi)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat sach)) ky nang cao hoi. hieu va pham thuc day ((hanh di) OR (hanh vi)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) ky nang cao hoi. hieu va pham thuc day ((hanh di) OR (hanh vi)) cua te*.