Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
cau tren » cu tren, dau tren, ca tren
hieu cao » chieu cao, hieu cac, hieu ca
chat hoa » thuat hoa, chat va, chat huu
tang xa » trang xa, tang ma, lang xa
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
sac ky » cac ky
hoa va » hoa van, hoa xa, hoa vo

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) tang xa hoi. hieu cao chat hoa va danh vi ((cau tren) OR (cau theo))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) OR (sai ky)) tang xa hoi. hieu cao chat hoa va danh vi ((cau tren) or (cau theo))~".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) OR (sai ky)) tang xa hoi. hieu cao chat hoa va danh vi ((cau tren) or (cau theo))*.