Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
va trien » va truyen, va tuyen, va tieng
hanh mau » thanh mau, anh mau, hanh ma
qua cac » cua cac
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
qua cao » qua ca, qua cai, qua cho
hoc van » hoc dan, hoc va, hoc vat
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
ha hoi » hoa hoi, ha noi, xa hoi
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky lang ha hoi. hieu ((qua cao) or (qua cac)) hoc van hanh mau ((va trien) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky lang ha hoi. hieu ((qua cao) OR (qua cac)) hoc van hanh mau ((va trien) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky lang ha hoi. hieu ((qua cao) or (qua cac)) hoc van hanh mau ((va trien) OR (va thiet))".
• Adding a wildcard symbol may retrieve word variants: su xac ky lang ha hoi. hieu ((qua cao) or (qua cac)) hoc van hanh mau ((va trien) OR (va thiet))*.