Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, nam thuc, cam thu
thu hanh » thuc hanh, thu thanh, thuy hanh
hanh lam » thanh lap, hanh kem, hanh va
tu sach » thu sach, te sach, tu cach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
hanh xu » hanh tu, hanh sua, hanh cua
su sach » so sach, vu sach
ve cam » ve cham, ve cac, va cam
xu hoi » xa hoi, lu hoi, vu hoi
thiet » thieu

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) OR (su sach)) thu hanh xu hoi. hieu ve cam thuc va hanh lam ((cua triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) thu hanh xu hoi. hieu ve cam thuc va hanh lam ((cua triet) OR (va thiet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) thu hanh xu hoi. hieu ve cam thuc va hanh lam ((cua triet) or (va thiet))*".