Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
cau tren » cu tren, ca tren, cau treo
quan cau » quang cao, toan cau, quan ha
nang va » nang van, hang va, nang ma
va nang » van nang, da nang, cam nang
truc va » thuc va, thuc vat, trung va
vu sach » vu bach, su sach, vu khach
qua cac » cua cac
lang xa » lang ha, dang xay, lang van
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: vu sach y lang xa hoi. hieu ((quan cau) or (qua cac)) truc va nang va ((cau tren) OR (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y lang xa hoi. hieu ((quan cau) OR (qua cac)) truc va nang va ((cau tren) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y lang xa hoi. hieu ((quan cau) or (qua cac)) truc va nang va ((cau tren) OR (dau tren))".
• Adding a wildcard symbol may retrieve word variants: vu sach y lang xa hoi. hieu ((quan cau) or (qua cac)) truc va nang va ((cau tren) OR (dau tren))*.