Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van tham » van thanh, van tuan, van chat
cau tren » cu tren, ca tren, cau treo
tham soc » cham soc, tham nuoc, thai son
dau tren » dau tien, dat tren, dau tieng
hieu van » hieu va, thien van, lieu va
va tinh » may tinh
lang ha » long ha
va hanh » van hanh, va thanh, va danh
ha hoi » hoa hoi, ha noi, xa hoi
y lang » o lang, _ lang, tay lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y lang ha hoi. hieu van tham soc ((va hanh) or (va tinh)) vi ((cau tren) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y lang ha hoi. hieu van tham soc ((va hanh) OR (va tinh)) vi ((cau tren) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: hoc sach y lang ha hoi. hieu van tham soc ((va hanh) or (va tinh)) vi ((cau tren) or (dau tren))*.