Perhaps you should try some spelling variations:
pham thuc » phap thuc, nham thuc, pham thu
pham chuc » pham duc, pham huu, kham chua
thu sach » tu sach, thuat sach, thuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
day hanh » day nhanh, day thanh, dao hanh
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
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) or (hoc sach)) ky nang cao hoi. hieu ve ((pham thuc) OR (pham chuc)) day hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (hoc sach)) ky nang cao hoi. hieu ve ((pham thuc) OR (pham chuc)) day hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (hoc sach)) ky nang cao hoi. hieu ve ((pham thuc) OR (pham chuc)) day hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (hoc sach)) ky nang cao hoi. hieu ve ((pham thuc) OR (pham chuc)) day hanh di cua te*.