Perhaps you should try some spelling variations:
van trinh » van thinh, van tinh, dan trinh
trinh san » trinh han, trinh quan, trinh toan
cam thuc » am thuc, nam thuc, can thuc
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
cam thu » nam thu, cac thu, ca thu
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa
te sai » te tai, te bai, te lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky nang ma hoi. hieu ve ((cam thuc) or (cam thu)) van trinh san ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky nang ma hoi. hieu ve ((cam thuc) OR (cam thu)) van trinh san ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sai ky nang ma hoi. hieu ve ((cam thuc) or (cam thu)) van trinh san ((cua tre) or (cuu tre))*.