Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
day thanh » dao thanh, dat thanh, dam thanh
da thanh » dao thanh, dat thanh, dam thanh
ve pham » vi pham, v pham, ve phan
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
co hoi » co hoc, co loi
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 ky) or (sach y)) nang co hoi. hieu ve pham thuc ((day thanh) OR (da thanh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) nang co hoi. hieu ve pham thuc ((day thanh) OR (da thanh)) di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach y)) nang co hoi. hieu ve pham thuc ((day thanh) OR (da thanh)) di cua te".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach y)) nang co hoi. hieu ve pham thuc ((day thanh) OR (da thanh)) di cua te*.