Perhaps you should try some spelling variations:
dang thai » dang thi, dang hai, dang khai
danh thai » anh thai, dinh thai, danh thanh
cham luc » cham soc, nhan luc, cham cuu
cua tre » cua te, cuu tre, cua triet
hieu va » hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
te sac » te sach, te cac, te san

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 xa hoi. ((hieu va) or (lieu va)) cham luc va ((danh thai) OR (dang thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang xa hoi. ((hieu va) OR (lieu va)) cham luc va ((danh thai) OR (dang thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang xa hoi. ((hieu va) or (lieu va)) cham luc va ((danh thai) OR (dang thai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang xa hoi. ((hieu va) or (lieu va)) cham luc va ((danh thai) OR (dang thai)) cua tre*.