Perhaps you should try some spelling variations:
trinh cuu » trinh cau, trinh cua, trinh chu
cham luc » cham soc, nhan luc, cham cuu
kho tang » cao tang
tri cuu » tri cua, tra cuu, troi cua
va xanh » va danh, va hanh, va anh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, ky trong
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa
vu ban » tu ban, va ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ban ((ky tang) OR (kho tang)) ma hoi. hieu ve cham luc va xanh ((tri cuu) or (trinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ban ((ky tang) OR (kho tang)) ma hoi. hieu ve cham luc va xanh ((tri cuu) OR (trinh cuu)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ban ((ky tang) OR (kho tang)) ma hoi. hieu ve cham luc va xanh ((tri cuu) or (trinh cuu)) tre*".