Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
dan hang » ban hang, van hang, dat hang
thuc dan » thuc hanh, hoc dan, thuc vat
nang doc » nang luc
hieu ve » hieu va, hieu van
hang di » hang doi, hang vi, hang dien
ve pham » vi pham, v pham, ve phan
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang co » nang cao, nang noi, nang 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: tu sach ty ((nang co) OR (nang doc)) hoi. hieu ve pham thuc dan hang di cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang co) OR (nang doc)) hoi. hieu ve pham thuc dan hang di cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang co) OR (nang doc)) hoi. hieu ve pham thuc dan hang di cua te*.