Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
pham huu » pham duc, pham duy, phan huy
sanh ty » sach ty, canh tay
lam cua » nam cua, lam chat
va hanh » va thanh, va danh, ban hanh
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
va pham » van pham, va phat, va phap
ma hoi » mai hoi, xa hoi, ma hoa
anh ta » anh tu, anh va, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sanh ty) or (anh ta)) nang ma hoi. hieu va pham huu ((va hanh) OR (van hanh)) lam cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sanh ty) OR (anh ta)) nang ma hoi. hieu va pham huu ((va hanh) OR (van hanh)) lam cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sanh ty) or (anh ta)) nang ma hoi. hieu va pham huu ((va hanh) OR (van hanh)) lam cua viet".
• Adding a wildcard symbol may retrieve word variants: so ((sanh ty) or (anh ta)) nang ma hoi. hieu va pham huu ((va hanh) OR (van hanh)) lam cua viet*.