Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
day nang » da nang, may nang, dai nang
thuc day » thuc dan, thuc vat
cua tre » cuu tre, cua triet, dua tren
nang di » nang du, hang di, nang ji
ve phap » va phap, de phap, ve phan
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
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 ky) or (sach y)) nang cao hoi. hieu ve phap thuc day nang di ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) nang cao hoi. hieu ve phap thuc day nang di ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach y)) nang cao hoi. hieu ve phap thuc day nang di ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach y)) nang cao hoi. hieu ve phap thuc day nang di ((cua tre) OR (cua te))*.