Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thu sach » tu sach, thuat sach, thuoc sach
thuc day » thuc dan, thuc vat
day nang » da nang, may nang, dai nang
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
nang di » nang du, hang di, nang ji
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua su, cua cu

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 y nang cao hoi. hieu ve pham thuc day nang di ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang cao hoi. hieu ve pham thuc day nang di ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: thu sach y nang cao hoi. hieu ve pham thuc day nang di ((cua te) or (cua tu))*.