Perhaps you should try some spelling variations:
phan thuc » nhan thuc, phap thuc, pham thuc
thuc day » thuc dan, thuc vat
thu sac » thu sach, thu san, thu xac
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
ve phan » va phan, ke phan, ve phat
hieu ve » hieu va, hieu van
doi moi » doi voi
doi hoi » doi thoi, doi voi, dai hoi
sac ky » cac ky, sai ky
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 sac ky nang ((doi hoi) OR (doi moi)). hieu ve phan thuc day ((hanh di) or (hanh de)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang ((doi hoi) OR (doi moi)). hieu ve phan thuc day ((hanh di) OR (hanh de)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang ((doi hoi) OR (doi moi)). hieu ve phan thuc day ((hanh di) or (hanh de)) cua te".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang ((doi hoi) OR (doi moi)). hieu ve phan thuc day ((hanh di) or (hanh de)) cua te*.