Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
dang xay » dang van, van xay
cau tren » cu tren, dau tren, ca tren
sinh ky » sinh ly, sinh y, kinh ky
lang xa » lang ha
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
ky cau » ky chau, ke cau
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh ky ((((lang xa) OR (lang van))) or (dang xay)) hoi. hieu ky cau truc va danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh ky ((((lang xa) OR (lang van))) OR (dang xay)) hoi. hieu ky cau truc va danh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sinh ky ((((lang xa) OR (lang van))) or (dang xay)) hoi. hieu ky cau truc va danh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: hoc sinh ky ((((lang xa) OR (lang van))) or (dang xay)) hoi. hieu ky cau truc va danh vi cau tren*.