Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
hoc cac » hoc cao
mai hoi » mai khoi, dai hoi, lai hoi
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
va dinh » van dinh, va kinh, vu dinh
va tinh » may tinh
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 cac ky nang mai hoi. hieu van cau duc ((va dinh) or (va tinh)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc cac ky nang mai hoi. hieu van cau duc ((va dinh) OR (va tinh)) vi cau tren.
• Adding a wildcard symbol may retrieve word variants: hoc cac ky nang mai hoi. hieu van cau duc ((va dinh) or (va tinh)) vi cau tren*.