Perhaps you should try some spelling variations:
tinh gian » tinh gia, tinh giao, trinh giang
gian cua » gian xu, ban cua
ky tang » ky dang, kho tang, ky trong
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
vu sac » vu sach, vu san, va sac
va cau » van cau, va cac, va dau
luc va » tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ((ky tang) or (ky nang)) xa hoi. hieu va cau ((luc va) OR (duc va)) tinh gian cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ((ky tang) OR (ky nang)) xa hoi. hieu va cau ((luc va) OR (duc va)) tinh gian cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ((ky tang) or (ky nang)) xa hoi. hieu va cau ((luc va) OR (duc va)) tinh gian cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sac ((ky tang) or (ky nang)) xa hoi. hieu va cau ((luc va) OR (duc va)) tinh gian cua tre*.