Perhaps you should try some spelling variations:
thien van » thi van
dau tren » dau tien, dat tren, dau tieng
le quang » vu quang
cau tren » cu tren, ca tren, cau treo
sach le » cach le, sach de, sach lo
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
quang d » quang de, quang do, quang _
cac luc » cau luc, cac nuoc, cac cuoc
d ho » x ho, d h, a ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach le quang d ho. thien van ((cac luc) or (coc luc)) va hanh vi ((cau tren) OR (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach le quang d ho. thien van ((cac luc) OR (coc luc)) va hanh vi ((cau tren) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach le quang d ho. thien van ((cac luc) or (coc luc)) va hanh vi ((cau tren) OR (dau tren))".
• Adding a wildcard symbol may retrieve word variants: su sach le quang d ho. thien van ((cac luc) or (coc luc)) va hanh vi ((cau tren) OR (dau tren))*.