Perhaps you should try some spelling variations:
thien van » thi van
lang chai » lang ha, lang cua, lang phi
cau triet » cau trieu, su triet, cua triet
danh hai » dang hai, lanh hai, manh hai
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
cam tu » cam thu, nam tu, dam tu

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 nang ma hoa. ((thien van) or (hieu va)) cam tu va ((danh hai) or (lang chai)) cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang ma hoa. ((thien van) OR (hieu va)) cam tu va ((danh hai) OR (lang chai)) cau triet.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ma hoa. ((thien van) or (hieu va)) cam tu va ((danh hai) or (lang chai)) cau triet*.