Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
thuc van » thuc vat, thuc dan, thuc va
van manh » van minh, van anh, van hanh
manh hai » lanh hai, minh hai, thanh hai
cau treo » cau theo, cau tren, cau trieu
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. hieu van cam thuc van manh hai ((cau treo) OR (cau triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu van cam thuc van manh hai ((cau treo) OR (cau triet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu van cam thuc van manh hai ((cau treo) OR (cau triet))*.