Perhaps you should try some spelling variations:
phan thuc » phap thuc, pham thuc, phan khuc
nhan thuc » nhan luc, dan thuc, toan thuc
may nang » may nong, ky nang, cam nang
day hanh » day nhanh, day thanh, day manh
dao hanh » dao thanh, dang hanh, ban hanh
so mang » so dang, so lang, do mang
hieu ve » hieu va, hieu van
hai cuu » hai cua, hai chu, hai cuc
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: so mang may nang x ho. hieu ve ((phan thuc) or (nhan thuc)) ((day hanh) OR (dao hanh)) hai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so mang may nang x ho. hieu ve ((phan thuc) OR (nhan thuc)) ((day hanh) OR (dao hanh)) hai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so mang may nang x ho. hieu ve ((phan thuc) or (nhan thuc)) ((day hanh) OR (dao hanh)) hai cuu tre*".