Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chat » cao chat
thi nang » thi cong, ki nang, thi hanh
cau tren » dau tren, ca tren, cau treo
thanh da » thanh dat, thanh dam, thanh dan
thu bang » thu ban, thu hang, chu bang
chat soc » cham soc, chat hoc, chat doc
soc gia » toc gia, hoc gia, so gia
so sach » so sanh, bo sach, co sach
cu tren » tu tren, dua tren
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((thi nang) or (thu bang)) ma hoi. hieu van chat soc gia thanh da ((cau tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((thi nang) OR (thu bang)) ma hoi. hieu van chat soc gia thanh da ((cau tren) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: so sach ((thi nang) or (thu bang)) ma hoi. hieu van chat soc gia thanh da ((cau tren) or (cu tren))*.