Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
hang tai » hang va, dung tai
vu sach » vu bach, su sach, vu khach
han tai » nhan tai, van tai, toan tai
luc van » luoc van, luu van, duc van
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
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: vu sach ky ((nang ma) or (nang x)) hoi. hieu ve cham luc van ((han tai) OR (hang tai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang ma) OR (nang x)) hoi. hieu ve cham luc van ((han tai) OR (hang tai)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((nang ma) or (nang x)) hoi. hieu ve cham luc van ((han tai) OR (hang tai)) va thiet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang ma) or (nang x)) hoi. hieu ve cham luc van ((han tai) OR (hang tai)) va thiet*.