Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, mang may
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
luc van » luoc van, luu van, duc van
cuu tre » cua tre, cau tren, cau treo
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
vi cuu » vi luu, vinh cuu

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 ((nang xa) or (((nang ma) OR (nang cao)))) hoi. hieu ve cham luc van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (((nang ma) OR (nang cao)))) hoi. hieu ve cham luc van hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((nang xa) or (((nang ma) OR (nang cao)))) hoi. hieu ve cham luc van hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (((nang ma) OR (nang cao)))) hoi. hieu ve cham luc van hanh vi cuu tre*.