Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
luc van » luoc van, luu van, duc van
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hanh de » hanh ve, hanh kem
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
te sac » te sach, te cac, te san
ha hoi » hoa hoi, ha noi, xa hoi
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky lang) OR (ky tang)) ha hoi. hieu ve cau luc van ((hanh de) or (hanh vi)) va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky lang) OR (ky tang)) ha hoi. hieu ve cau luc van ((hanh de) OR (hanh vi)) va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky lang) OR (ky tang)) ha hoi. hieu ve cau luc van ((hanh de) or (hanh vi)) va trien".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky lang) OR (ky tang)) ha hoi. hieu ve cau luc van ((hanh de) or (hanh vi)) va trien*.