Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
va triet » va thiet, va trien, ve triet
va trinh » van trinh, va tinh, lap trinh
dan thuc » dan toc, am thuc
dam thuc » am thuc, nam thuc, dai thuc
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cam tu » cam thu, nam tu, dam tu
ma hoi » mai hoi, xa hoi, ma hoa
van va » van vat, van van, ban va

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 ky nang ma hoi. hieu ve ((cam tu) or (((dam thuc) OR (dan thuc)))) va trinh van va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu ve ((cam tu) OR (((dam thuc) OR (dan thuc)))) va trinh van va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu ve ((cam tu) or (((dam thuc) OR (dan thuc)))) va trinh van va triet*".