Perhaps you should try some spelling variations:
tinh vinh » tinh ninh, tinh binh, tinh hinh
vinh cau » sinh cau, vinh cuu, minh cau
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
va tinh » may tinh
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) y nang x hoi. hieu ((van lam) OR (van nam)) tuc va tinh vinh cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang x hoi. hieu ((van lam) OR (van nam)) tuc va tinh vinh cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) y nang x hoi. hieu ((van lam) OR (van nam)) tuc va tinh vinh cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) y nang x hoi. hieu ((van lam) OR (van nam)) tuc va tinh vinh cau tren*.