Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cam thuc » am thuc, nam thuc, cam thu
cau tren » cu tren, dau tren, ca tren
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
sach ky » sac ky, sach y, sach ty
te sach » toc sach
hieu ve » hieu va, hieu van
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
thuc va » thuc vat, thuc dan, thuc day
ve cam » ve cham, ve cac, va cam
ha hoi » hoa hoi, ha noi, xa hoi
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 ky lang ha hoi. hieu ve cam thuc va tinh vi ((cua te) or (((cau tren) or (cau triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang ha hoi. hieu ve cam thuc va tinh vi ((cua te) OR (((cau tren) OR (cau triet)))).
• Adding a wildcard symbol may retrieve word variants: te sach ky lang ha hoi. hieu ve cam thuc va tinh vi ((cua te) or (((cau tren) or (cau triet))))*.