Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
hanh hai » thanh hai, nhanh hai, hang hai
va hanh » van hanh, va thanh, va danh
so sinh » so sanh, so tinh, cho sinh
ly nang » ly hang, ly vang, ly quang
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sinh ((ly nang) OR (ky nang)) ma hoi. hieu van cam tuc va hanh hai ((cau triet) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sinh ((ly nang) OR (ky nang)) ma hoi. hieu van cam tuc va hanh hai ((cau triet) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sinh ((ly nang) OR (ky nang)) ma hoi. hieu van cam tuc va hanh hai ((cau triet) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: so sinh ((ly nang) OR (ky nang)) ma hoi. hieu van cam tuc va hanh hai ((cau triet) or (cau tren))*.