Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cam thuc » am thuc, nam thuc, cam thu
su triet » su viet, su tien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
dang xay » dang van, van xay
dan hanh » dang hanh, dan khanh, dan thanh
sach tai » sach bai, sach tham, sach dao
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
lang xa » lang ha, lang van
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tai ((lang xa) OR (dang xay)) hoi. hieu ve cam thuc dan hanh lai ((su triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tai ((lang xa) OR (dang xay)) hoi. hieu ve cam thuc dan hanh lai ((su triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tai ((lang xa) OR (dang xay)) hoi. hieu ve cam thuc dan hanh lai ((su triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: su sach tai ((lang xa) OR (dang xay)) hoi. hieu ve cam thuc dan hanh lai ((su triet) or (cua viet))*.