Perhaps you should try some spelling variations:
thanh minh » thanh binh, thanh tinh, thanh vinh
can tren » van tren, cau tren, dan tren
te sach » toc sach
cau duc » cao duc, cau luc, chu duc
duc gia » quoc gia
ca tren » cau tren, cu tren, la tren
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang xa hoi. ((hieu ve) or (lieu va)) cau duc gia thanh minh ((can tren) OR (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. ((hieu ve) OR (lieu va)) cau duc gia thanh minh ((can tren) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. ((hieu ve) or (lieu va)) cau duc gia thanh minh ((can tren) OR (ca tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. ((hieu ve) or (lieu va)) cau duc gia thanh minh ((can tren) OR (ca tren))*.