Perhaps you should try some spelling variations:
tuan gianh » tuan anh, tuan minh, tran giang
gianh dai » gianh lai, gian dan, giang day
cua viet » ca viet, hoa viet, cua dieu
duc tuan » duc thuan, duc tan, duc toan
cham duc » pham duc, cham soc, pham duy
hieu va » lieu va, hieu qua
va cham » va chat, va tham
tu sach » thu sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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)) ty nang o hoi. hieu va cham duc tuan gianh dai ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang o hoi. hieu va cham duc tuan gianh dai ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang o hoi. hieu va cham duc tuan gianh dai ((cua viet) or (cua vat))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang o hoi. hieu va cham duc tuan gianh dai ((cua viet) or (cua vat))*.