Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
toc sach » hoc sach, doc sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
ly nang » ly hang, ly vang, ly quang
va pham » van pham, va phat, va phap
hanh di » hanh vi, hanh de, hang di
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: ((te sach) or (toc sach)) ((ly nang) OR (ky nang)) cau hoi. lieu va pham thuc dan hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((ly nang) OR (ky nang)) cau hoi. lieu va pham thuc dan hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ((ly nang) OR (ky nang)) cau hoi. lieu va pham thuc dan hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((ly nang) OR (ky nang)) cau hoi. lieu va pham thuc dan hanh di cua te*.